【題目】他們相識許多年了。 (each other)

【答案】They have known each other for many years.
【解析】根據(jù)句意可知句子的時態(tài)要用現(xiàn)在完成時,have done, 主語是they, 謂語動詞要用復數(shù),相識:know each other, 許多年:many years, for+段時間和現(xiàn)在完成時連用,所以答案是They have known each other for many years.

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